In 2373, Admiral Hayes commanded the fleet defending Earth against the Borg in the Battle of Sector 001. When Hayes' flagship was destroyed, Captain Picard of the Enterprise took command over the fleet. Star Trek: First Contact
In 2374, Admiral Hayes was seen in data transmission that were "decoded" by Arturis, which led Voyager to the USS Dauntless. Janeway described Hayes as a "windbag". (VOY: "Hope and Fear")